裝燈一問

antony_wong2001 發表於 2012-2-22 11:34

                               
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會唔會 LED 係有電流限制？因為一入電流數值，得出答案太小，得幾 ohm。

For e.g
12V supply
3.3 led
20ma
will have:-

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JerryLeung12 發表於 2012-2-22 11:58

                               
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For e.g
12V supply
3.3 led

20 ma 係唔係 LED 嘅電流？

antony_wong2001 發表於 2012-2-22 12:03

                               
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20 ma 係唔係 LED 嘅電流？

they said :-
For 3mm and 5mm LEDs, this is usually 20 mA or close to it. A few special, high-power LEDs exist, but they always come with specs. So if you need to guess, use 20 here.

so if you use normal led (not super light, you can just use 20ma) is ok.

I give Ching a more interesting site , if you install more than one led:-
http://led.linear1.org/led.wiz

If same as before 12V 3.3led, 20ma but now 2 led

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回復 JerryLeung12 的帖子

Ching 請問3w led 3.6v 可否串2粒及用己多ohm 電阻，用11.1v 請指教：thx

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回復 JerryLeung12 的帖子

Ok thx ching